Transient and Cyclic Responses of Strain-Generated Potential in Rabbit Patellar Tendon Are Frequency and pH Dependent

[+] Author and Article Information
C. T. Chen

Division of Orthopedic Surgery, Department of Mechanical Engineering, University of Wisconsin, Madison, WI 53706James A. Baker Institute for Animal Health, Cornell University, Ithaca, NY 14853

R. P. McCabe

Division of Orthopedic Surgery, University of Wisconsin, Madison, WI 53792-3228

A. J. Grodzinsky

Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139

R. Vanderby

Division of Orthopedic Surgery, Department of Mechanical Engineering, University of Wisconsin, Madison, WI 53706

J Biomech Eng 122(5), 465-470 (Apr 28, 2000) (6 pages) doi:10.1115/1.1289639 History: Received April 16, 1998; Revised April 28, 2000
Copyright © 2000 by ASME
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Grahic Jump Location
Schematic drawing showing the experimental setup: a rabbit PT with electrodes inserted and with bone blocks intact gripped in a servohydraulic load frame
Grahic Jump Location
An example of SGP in rabbit PT reaching a plateau (or steady-state) potential (with a plateau relaxation time constant, τp, after applying 0.5 Hz of haversine tensile stress (MPa) for 50 seconds. After the tensile deformations are terminated and strain is removed, the plateau potential decays to a residual potential. This residual potential was not different from the original potential over all specimens (P=0.21).
Grahic Jump Location
Mean (±SD) of cyclic amplitude (magnified three times) and plateau potentials (mV/cm) show no significant difference between control and de/rehydration groups (n=6). The plateau potentials depend on loading frequency (P<0.0001).
Grahic Jump Location
Typical SGPs showing the effect of pH level at 4.7, 7.1, or 9.5
Grahic Jump Location
A titration curve of SGPs where ⋅ indicates the experimental data. Nonlinear least-squares regression extrapolates the isoelectric point to occur at pH=4.32(R2=0.94) using data from a 2.0 Hz loading.




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